5. Classify the following as elastic or inelastic collisions: (2 pts) a. A pool ball collides with the 8 ball sending it into the corner pocket:
b. A bullet collides with the target lodging itself in the wood:
C. A bowling ball strikes the pin and knocks it backward into another pin:
d. Fred jumps on Eric's back and they fall to the ground:

c.the charges if the proton and electron and gravity

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s